I disagree Matt. I use my WordPress blog as the one true source mostly (I can get lazy) & syndicate it to Twitter & FB. Everyone could be doing that. And I honestly don’t care if there’s a commercial motive, I just wish those that are hedging that way would say it and move on.
Because WP is a platform it “competes” with everything, and any one competitor you pick (like the ones you mention) seem irrelevant to a large portion of the current user and developer base. But it’s all part of the same flywheel. WP competes with Twitter, Insta, FB too.